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Current fftw source
author Chris Cannam
date Tue, 18 Oct 2016 13:40:26 +0100
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<!-- This manual is for FFTW
+(version 3.3.5, 30 July 2016).
+
+Copyright (C) 2003 Matteo Frigo.
+
+Copyright (C) 2003 Massachusetts Institute of Technology.
+
+Permission is granted to make and distribute verbatim copies of this
+manual provided the copyright notice and this permission notice are
+preserved on all copies.
+
+Permission is granted to copy and distribute modified versions of this
+manual under the conditions for verbatim copying, provided that the
+entire resulting derived work is distributed under the terms of a
+permission notice identical to this one.
+
+Permission is granted to copy and distribute translations of this manual
+into another language, under the above conditions for modified versions,
+except that this permission notice may be stated in a translation
+approved by the Free Software Foundation. -->
+<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
+<head>
+<title>FFTW 3.3.5: Guru Real-to-real Transforms</title>
+
+<meta name="description" content="FFTW 3.3.5: Guru Real-to-real Transforms">
+<meta name="keywords" content="FFTW 3.3.5: Guru Real-to-real Transforms">
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+<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
+<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
+<link href="Guru-Interface.html#Guru-Interface" rel="up" title="Guru Interface">
+<link href="64_002dbit-Guru-Interface.html#g_t64_002dbit-Guru-Interface" rel="next" title="64-bit Guru Interface">
+<link href="Guru-Real_002ddata-DFTs.html#Guru-Real_002ddata-DFTs" rel="prev" title="Guru Real-data DFTs">
+<style type="text/css">
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+
+<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
+<a name="Guru-Real_002dto_002dreal-Transforms"></a>
+<div class="header">
+<p>
+Next: <a href="64_002dbit-Guru-Interface.html#g_t64_002dbit-Guru-Interface" accesskey="n" rel="next">64-bit Guru Interface</a>, Previous: <a href="Guru-Real_002ddata-DFTs.html#Guru-Real_002ddata-DFTs" accesskey="p" rel="prev">Guru Real-data DFTs</a>, Up: <a href="Guru-Interface.html#Guru-Interface" accesskey="u" rel="up">Guru Interface</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
+</div>
+<hr>
+<a name="Guru-Real_002dto_002dreal-Transforms-1"></a>
+<h4 class="subsection">4.5.5 Guru Real-to-real Transforms</h4>
+
+<div class="example">
+<pre class="example">fftw_plan fftw_plan_guru_r2r(int rank, const fftw_iodim *dims,
+                             int howmany_rank,
+                             const fftw_iodim *howmany_dims,
+                             double *in, double *out,
+                             const fftw_r2r_kind *kind,
+                             unsigned flags);
+</pre></div>
+<a name="index-fftw_005fplan_005fguru_005fr2r"></a>
+
+<p>Plan a real-to-real (r2r) multi-dimensional <code>FFTW_FORWARD</code>
+transform with transform dimensions given by (<code>rank</code>, <code>dims</code>)
+over a multi-dimensional vector (loop) of dimensions
+(<code>howmany_rank</code>, <code>howmany_dims</code>).  <code>dims</code> and
+<code>howmany_dims</code> should point to <code>fftw_iodim</code> arrays of length
+<code>rank</code> and <code>howmany_rank</code>, respectively.
+</p>
+<p>The transform kind of each dimension is given by the <code>kind</code>
+parameter, which should point to an array of length <code>rank</code>.  Valid
+<code>fftw_r2r_kind</code> constants are given in <a href="Real_002dto_002dReal-Transform-Kinds.html#Real_002dto_002dReal-Transform-Kinds">Real-to-Real Transform Kinds</a>.
+</p>
+<p><code>in</code> and <code>out</code> point to the real input and output arrays; they
+may be the same, indicating an in-place transform.
+</p>
+<a name="index-flags-7"></a>
+<p><code>flags</code> is a bitwise OR (&lsquo;<samp>|</samp>&rsquo;) of zero or more planner flags,
+as defined in <a href="Planner-Flags.html#Planner-Flags">Planner Flags</a>.
+</p>
+
+
+
+</body>
+</html>